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Fix VCR scrubber: pause after replay ends, hold playhead position

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Two root causes fixed:
1. startReplay() was calling vcrResumeLive() when buffer exhausted,
   snapping back to LIVE mode. Now pauses instead.
2. updateTimelinePlayhead() recalculated position from timestamps
   relative to now (which shifts). Now holds at dragPct position
   when paused after a scrub.
This commit is contained in:
you
2026-03-19 07:01:01 +00:00
parent 8da7603d0c
commit 43bd3d07c2
1 changed files with 11 additions and 10 deletions
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public/live.js
+11 -10
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@@ -162,8 +162,8 @@
function tick() {
if (VCR.mode !== 'REPLAY') return;
if (VCR.playhead >= VCR.buffer.length) {
// Caught up — go live
vcrResumeLive();
// Caught up — pause instead of auto-resuming live
vcrSetMode('PAUSED');
return;
}
const entry = VCR.buffer[VCR.playhead];
@@ -342,17 +342,18 @@
// Redraw sparkline (cheap, avoids double-buffer complexity)
// Just draw playhead line on top — clear only the line area
let playTs;
let x;
if (VCR.mode === 'LIVE' || VCR.playhead < 0) {
playTs = now;
} else if (VCR.playhead < VCR.buffer.length) {
playTs = VCR.buffer[VCR.playhead].ts;
x = cw; // rightmost = now
} else if (VCR.playhead >= 0 && VCR.playhead < VCR.buffer.length) {
const playTs = VCR.buffer[VCR.playhead].ts;
x = ((playTs - startTs) / scopeMs) * cw;
} else if (VCR.mode === 'PAUSED' && VCR.dragPct != null) {
// After scrub, hold at last drag position
x = VCR.dragPct * cw;
} else {
playTs = now;
x = cw;
}
const x = ((playTs - startTs) / scopeMs) * cw;
// We overlay a playhead marker — use a separate tiny canvas or just draw
const playheadEl = document.getElementById('vcrPlayhead');
if (playheadEl) {
playheadEl.style.left = Math.max(0, Math.min(cw - 2, x)) + 'px';